Opt Chain Measurement

Ashtead Technology’s Optical Chain Measurement System (CMS) is a ROV-deployed optical caliper imaging device, which measures mooring chain dimensions and the material condition of links. The tool is positioned on a link to capture video data, yielding real-time measurement results. This data is processed to produce measurements of intergrip, sidebar diameters and link length.

Measurement of chain dimensions is critical to confirm that chain corrosion and wear rates are within expected tolerances and that chains maintain their minimum strength requirements throughout their lifetime. The optical CMS can collect intergrip length, sidebar diameters and link length measurements all in a single ROV dive.

With over 25-years of commercial use and continuous improvement, the CMS is the most reliable, repeatable and efficient method of monitoring mooring chain integrity.

Chain surface preparation should be carried out prior to CMS deployment to remove bulky marine growth from links and all growth from apices. Ashtead Technology’s Subsea Cleaning Tool (SCT) is recommended for highest efficiency.

For more information please read our Mooring Chain Measurement FAQ